INSECTS AFFKCTIXG PARK AND WOODLAND TREES 



343 



that its larxac arc coninioii uiuk-r the thick Ixirk of pine loi^s and stuiii|)s. 

 Dr I-'itch notices this insect brietl)' and e\iclenlly consitlered it one of the 

 •common species in New York State. Dr Packard records the occurrence 

 of larvae and immature beetles in abundance at Brunswick Me., in the mid- 

 dle of March. Dr A. D. Hojjkins states that this insect was very common 

 in West \'irginia from 1890-9.4, when it attacked all the pines and Norway 

 spruce, workini^ near the base of living and dying trees and in stumps. He 

 also observes that it is wideU' distributed. 



Description. The adult is a rather stout brownish beetle from about 

 3/16 to j/l inch long. It is probable that in a large series there would be 



Fig. 64 Dendroctonus ter 

 brans (author's illustration) 



Fig. 65 Pupa of Den- 

 droctonus terebrans 



Fiu. 66 Anal plate of larva of 

 Dendroctonus tere- 

 brans (author's illustration) 



considerable range in color, as is the case in many other bark beetles. The 

 jaws are black, the eyes are finely granulated and the head and thorax 

 thickly and somewhat coarsely punctured. The wing or elytra are striated 

 and somewhat coarsely punctured. The general form of the beetle and 

 certain structural details are shown in figure 64. 



The pupa is white, quite stout and about -'^ inch long. The lateral 

 edges of the abdominal segments are each provided with a rather stout 

 fleshy spine tipped with a dark chitinous point. A pair of similar spines 

 are found on the last segment and smaller, scattering ones on the dorsal 



